Focus can be spelled with either a single or a double s focused/focussed, focusing/focussing

A lot of spellers don't know this rule but just see what looks right- "we always say that looks strange". But it's always good to know why spelling is the way it is and the rules.

Which of these are right? Use your visual memory for what looks right or the rule.
1. shoper or shopper?
2. foxes or foxxes?
3. beginner or beginer?
4. fatest or fattest?
5. sleeping or sleepping?
6. forgettable or forgetable?
7. quicker or quickker?
8. planning or planing?
9. budgetting or budgeting?
10. quizzed or quized?

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